Degradation of Calcined Clay-Limestone Cementitious Composites Under Sulfate Attack

2017 ◽  
pp. 110-116 ◽  
Author(s):  
Cheng Yu ◽  
Peng Yuan ◽  
Xin Yu ◽  
Jiaping Liu
Keyword(s):  
Sulfate Attack ◽  
Cementitious Composites ◽  
Calcined Clay

How Efficient are LC3 and GGBFS-Contained Mortar Mixtures Submerged into Na2SO4 Solution against External Sulfate Attack at an early Age?

2021 ◽  
Vol 902 ◽  
pp. 145-151
Author(s):  
Islam Orynbassarov ◽  
Chang Seon Shon ◽  
Jong Ryeol Kim ◽  
Umut Bektimirova ◽  
Aidyn Tugelbayev
Keyword(s):  
Synergistic Effect ◽  
Construction Materials ◽  
Sulfate Attack ◽  
Early Age ◽  
Weight Changes ◽  
Calcined Clay ◽  
Initial Strength ◽  
Sulfate Resistance ◽  
Dense Microstructure ◽  
Pozzolanic Materials

Ordinary Portland cement (OPC) is one of the most widely used construction materials in civil engineering infrastructure construction but it is susceptible to sulfate attack. One of the ways to improve the sulfate resistance of an OPC mortar/concrete is to replace a certain amount of OPC with different pozzolanic materials such as ground granulated blast furnace slag (GGBFS) and metakaolin. The use of pozzolanic materials to mortar/concrete not only enhances durability but also reduces carbon dioxide (CO2) emission due to the less usage of OPC at the initial construction state. As considering these aspects, limestone calcined clay cement (LC3) has been developed in recent decades. However, the influence of LC3 on sulfate attack resistance has not been fully evaluated. Therefore, this study investigated the efficiency of LC3 mortar mixtures against sulfate attack at an early age (approximately 4.5 months) after two different curing periods, namely 1-day and 3-day curing, since the strength of the LC3 mixture is lower than OPC mixtures. To evaluate the synergistic effect of a combination of LC3 and GGBFS on the sulfate resistance, the LC3 and OPC mixtures containing 25% GGBFS were also assessed in terms of density, porosity, compressive strength, volumetric expansion, and weight changes. The experiment results show that the expansion of the LC3 mixture regardless of the addition of GGBFS and an initial curing strength made a plateau after a rapid increase up to 7 days, while the expansion of the OPC mixture kept increasing throughout the period. Furthermore, the addition of GGBFS to OPC or LC3 mixture provides the synergistic effect on reducing the expansion due to sulfate attack. Therefore, if LC3 mixture has high initial strength (min. 15 MPa) and dense microstructure to minimize the penetration of sulfate ion into the mixture, it is expected that LC3 mixture is more efficient than OPC mixture against the sulfate attack.

Mechanical and durability performance of FRP confined and unconfined strain hardening cementitious composites exposed to sulfate attack

2019 ◽  
Vol 207 ◽  
pp. 158-173 ◽  
Author(s):  
Alaa Mohammedameen ◽  
Mehmet Eren Gülşan ◽  
Radhwan Alzeebaree ◽  
Abdulkadir Çevik ◽  
Anıl Niş
Keyword(s):  
Strain Hardening ◽  
Sulfate Attack ◽  
Cementitious Composites ◽  
Durability Performance

scholarly journals Engineered Cementitious Composites (ECC) with limestone calcined clay cement (LC3)

2020 ◽  
Vol 114 ◽  
pp. 103766
Author(s):  
Duo Zhang ◽  
Beata Jaworska ◽  
He Zhu ◽  
Kensey Dahlquist ◽  
Victor C. Li
Keyword(s):  
Cementitious Composites ◽  
Engineered Cementitious Composites ◽  
Calcined Clay

scholarly journals Sulfuric Acid Resistance of CNT-Cementitious Composites

2021 ◽  
Vol 11 (5) ◽  
pp. 2226
Author(s):  
Gun-Cheol Lee ◽  
Youngmin Kim ◽  
Soo-Yeon Seo ◽  
Hyun-Do Yun ◽  
Seongwon Hong
Keyword(s):  
Sulfuric Acid ◽  
Electrical Properties ◽  
Mechanical Performance ◽  
Cement Mortar ◽  
Acid Corrosion ◽  
Acid Resistance ◽  
Sulfate Attack ◽  
Cementitious Composites ◽  
Sulfuric Acid Solutions ◽  
Single Walled Cnts

This study analyzed changes in the durability characteristics of cement mortar incorporating carbon nanotube (CNT) and the electrical properties subjected to deterioration induced by sulfate attack. Powder types of multi-walled or single-walled CNTs were used and added to the composites with 1.0% and 2.0% mass fraction, and the specimens were immersed in 5% and 10% sulfuric acid solutions to investigate the durability of CNT cementitious composites. Although mechanical performance decreased due to relatively large pores (370–80 μm) caused by CNTs, specimens incorporating CNTs exhibited enhanced resistance to sulfuric acid as CNTs, which offered strong resistance to acid corrosion, and prevented contact between the cement hydrate and the sulfuric acid solution. Therefore, it is expected that self-sensing performance was exhibited because there were no significant differences in the electrical properties of cement mortar subjected to the deterioration by sulfate attack.

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